Fastening device for boxes for mine drilling-machines.



G. GRIFFITH. FASTENING DEVICE FOR. BOXES FOR MINE DRILUNG MACHINES.

APPLICATION FILED MAR. 9. 1914.

L1Q3fi3l a, Patented Jan. 5, 1915.

GEORGE GRIFFITH, OF DES MOINES, IOVI'A, ASSIGNOR OF ONE-HALF TO JOHN M.FERGUSON, OF DES MOINES, IOVIA.

FASTENING DEVICE FOR, BDXES FOR MINE DRILLING-MACHINES.

weaver.

Application filed March 9, 1914.

To all whom it may concern:

Be it known that I, GEORGE GRIFFITH, a citizen of the United States,residing at Des Moines, in the county of Polk and State of Iowa, haveinvented certain new and useful. Improvements in Fastening De vices forBoxes for Mine Drilling-Machines, of which the following is aspecification.

This invention relates to improvements in fastening devices forjointbearings or boxes, particularly adapted, though not-necessarily limitedin its use with mine drills, and one of the objects of the invention isto provide an improved device of this character where by the ordinaryfastening pin heretofore used, may be dispensed with, and at the sametime produce a more satisfactory and efiicient fastening.

To the attainment of these ends and the accomplishment of other new anduseful objects as will appear, the invention consists in the features ofnovelty in substantially the construction, combination and arrange mentof the several parts hereinafter more fully described and claimed andshown in the accompanying drawing illustrating the invention, and inwhich,

Figure 1 is a perspective view of a mine drill box, showing the box openand constructed in accordance with the principles of this invention.Fig. 2 is a vertical sectional view taken on line 22, Fig. 6. Fig. 3 isa front elevation of the fastening end of the box, with the catch deviceremoved. Fig. 4: is a front elevation of the catch. Fig. 5 is an endelevation of the catch. Fig. 6 is a view similar to Fig. 3 showing thecatch in position.

Referring more particularly to the drawing and in the present form ofthe inven tion, the drill box consists of two sections 10 and 11 whichare hinged together as at 12 in the ordinary and usual manner, and thesection 11 is provided with the trunnions 13 which are journaled in theordinary bearing to support the boxing.

The lateral faces 14: and 15 of the respective sections 10 and 11 arepreferably flat as shown, and in the section 14: there is pr0- vided aneccentric groove 16 while in the face 15 is provided an eccentric groove17, and these grooves are arranged to cooperate with each other, so thatthe smaller portion of one groove, or the smaller opening through theend of one groove,is adjacent the Specification of Letters Fatent.

Patented J an. 5, 1215.

Serial No. 823,360.

larger opening of the other groove, when the members 10 and 11 are in aclosed posi tion with respect to each other.

Rotatively supported by the trunnion 13 adjacent the faces 15, 16 of thebox members, is a catch 18, which is provided adjacent its extremitieswith cam shaped projections 19, 20, disposed in opposite direction withrespect to each other, and are so arranged that when the catch 18 ismounted upon the trunnion 13, and is rotated in the proper direction,the cam 19 will enter the groove 16, while the cam 20 simultaneouslyenters the groove 17 to eflectively secure the box members together.

In order to hold the catch against move ment longitudinally on thetrunnion 13, any suitable holding device may be provided, such forinstance as a collar or sleeve 21 to stand adjacent the outer face ofthe catch, and which collar may be held on the trunnion in any suitablemanner such as by means of a fastening device 22. To rotate the catch,wing shaped projections 23 are provided on the outer face thereof.

Thus it will be manifest that with this improved construction, all thatis necessary, is to close the two members 10 and 11 against each other,when the grooves 16, 17 will be properly positioned, to receive therespective cam or eccentric projections 19, 20 on the catch 18. To openthe box, the catch 18 is rotated in the opposite direction. It will alsobe noted that with this improved fastening device an effective lock issecured, and the movement of the boxing in its supporting bearings willnot be interfered with.

While the preferred form and construc tion have been herein shown anddescribed, it is to be understood that many changes may be made in thedetails of construction, and in the combination and arrangement of theseveral parts, without departing from the spirit of this invention.

What is claimed as new is 2- 1. In a device of the character described,the combination of a hinged sectional drill bearing, one of saidsections provided with laterally projecting supporting trunnions for thesections, and a catch carried by the said section and rotatably mountedupon one of the trunnions to extend across both sections, said catchhaving lateral projecting opposed eccentric cam shaped portions,

the adjacent lateral faces of the sections being provided with opposedeccentric shaped grooves opening through the edges of the sections forreceiving the respective cam portions.

2. In a device of the character described, the combination of a hingedsectional drill bearing, one of said sections provided With laterallyprojecting supporting trunnions for the sections, a catch carried by thesaid section and rotatably mounted upon one of the trunnions to extendacross both sections, said catch having lateral projecting opposedeccentric cam shaped portions, the adjacent lateral faces of thesections being provided With opposed eccentric shaped grooves openingthrough the edge of the sections for receiving the respective camportions, and a fastening device connected With the trunnion forsecuring the catch against displacement.

3. In a device of the character described,

the combination of a hinged sectional drill bearing, one of saidsections provided with laterally projecting supporting trunnions for thebearing, a catch carried by the said section and rotatably mounted uponone of the trunnions to extend across both sections, said catch havinglateral projecting opposed eccentric cam shaped portions, the adjacentlateral faces of the sections being provided with opposed eccentricshaped grooves opening through the edges of the sections for receivingthe respective cam portions, and projections arranged on opposite sidesof the pivot of the catch for manipulating the latter.

In Witness whereof, I hereunto subscribe my name to this specificationin the presence of tWo witnesses.

GEORGE GRIFFITH.

Witnesses:

MARION E. SCHROOK, E. W. JOHNSON.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner 01'. Patents, Washington, D. 0."

